For linux users:
1. open kobo, eject internal sdcard, put sdcard on pc
2. backup sdcard to image with
Code:
sudo dd if=/dev/mmcblk0 of=kobo.img bs=1M
sudo sync
3. extract original sdcard, insert new one and flash the image from the copy you created with
Code:
sudo dd if=kobo.img of=/dev/mmcblk0
sudo sync
4. open gparted and expand the vfat partition (the 3rd one) to match your sd empty space.
Windows users can do the same booting from cd/usb with Gparted live.
https://www.pendrivelinux.com/instal...using-windows/
https://www.howtoforge.com/partitioning_with_gparted